---
myst:
    substitutions:
        sentence: "..."
        sentence2: "(which means all attributes by default if the function is called without argument)"
        sentence3: ", for a simple double-precision attribute,"
        bloc:
            python: 1-4,11-19
            cpp: 4,7-13
        console:
            python: "7"
            cpp: "9"
---

```{include} /../core/dataserver/statistics/computing_ranking.md
```

This method has been modified in order to cope with constant size vectors, but also to stabilise its 
behaviour when going from one compiler version to another. The first modification only consists in 
considering every element of a constant-size vector independent from the others, so every element is 
in fact treated as if they were different attributes. The second part is more technical as the sorting 
method has been changed to use the `std::stable_sort` insuring that platforms (operating systems and 
compiler versions) will have the same behaviour. The main problem was raising when two patterns had 
the same value for the attribute under study. In this case, the ranking was not done in the same way 
depending on the version of the compiler. Now it should be treated in the same way: if two or more 
patterns have the same value for a specific attribute, the first met in the array of attribute value 
will have the value $i$ while the second one will be affected with $i+1$ and so on... Here is a small 
example of this computation:

{{                                                                                                  
    "```{literalinclude} " + parent_dir                                                             
    + "/roottest/uranie/doc/dataserver/use_cases/" + language + "/dataserverGeyserRank." 
    + extension + "\n"
    + ":language: " + language + "\n"
    + ":lines: " + bloc[language] + "\n"                                                   
    + "```"                                                                                         
}}  

This macro should returns

{{                                                                                                  
    "```{literalinclude} " + parent_dir                                                             
    + "/roottest/build/uranie/doc/dataserver/use_cases/" + language + "/dataserverGeyserRank.log\n"
    + ":lines: " + console[language] + "\n"
    + ":language: none\n"
    + "```"                                                                                         
}}  

```{admonition} Summary: computeRank
- `computeRank`(__const char\*__ varexp="\*", __option*__ option)

    Create a new attribute for every attribute requested (or for all attributes if no argument is 
    provided)

    String-type and non-constant-vector-type attribute are disregarded and a warning is shown to let 
    the user know.
```